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Install OS 10.7 to External when running OS 10.8

Discussion in 'Mac OS X Lion (10.7)' started by kunze50, Aug 26, 2012.

  1. macrumors regular

    Hi I'v formatted an old external and was hoping to install a copy of Lion on it, but cannot run the Lion installer since I'm on ML. Is there any way around this? Reason being a family members macbook cannot run Mountain Lion and they have corrupted their hard drive..
  2. Mal
    macrumors 603


    Restore the InstallESD.dmg image from the Lion installer to a flash drive or DVD-DL, or even onto a partition on your hard drive, then boot from that to do the install. There are a number of guides on how to do that if you need.

  3. macrumors regular

    Mal, I appreciate the reply.
    I have looked into locating the InstallESD.dmg file but it seems to be unavailable when running a current OS or higher. I'v also tried a free app: Lion Diskmaker 2.1 to receive an error, as again running ML may cause this..
  4. macrumors member

    Is this possible?

    Come the weekend I switch to an External drive with Snow Leopard running very nicely. But I have had an excessive amount of problems with Mountain Lion the day-to-day Internal drive, problems I never had with Lion.

    During the weekend I noticed some 32GB Flash Drives go down to an Unreal price level. I'm talking about less than $20.00 from PNY.

    So I'm suddenly wondering: Can I install Lion in a 32GB Flash Drive? There are many Apps I just don't use that often. Like Chess, Calender, Calculator and Contacts just to mention the C's. Deleting them would open up room and such.

    Or should I get two 32GB Flash drives and RAID them into a 64GB Drive?
    Or should I wait for the 64GB Drives to show up?
  5. Mal
    macrumors 603


    Doesn't matter what OS you're running, if you have the installer. Just right click on the installer, select Show Package Contents, and navigate to the file from there.


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